Mechanical movement.



C. J. ROBERTSON. MBOHANIOAL MOVEMENT. APPLIoATIoN FILED MAR. s, 1905.BBNEWED MAY 4,1909.

' 4Patented Jan. 4,1910.

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C. J. ROBERTSON. MBGHANIUAL MOVEMENT. APPLoATIoN FILED MAR. e, 190s.RENBWBD MAY 4,1909.

Patented Ja11.4,1.910.

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UNITED STATES PATENT oEEioE.

CHARLES J. ROBERTSON, 0F TAUNTON, MASSACHUSETTS, ASSIGNOR TO THECAMPBELL PRINTING PRESS & MANUFACTURING COMPANY, 0F NEW YORK, N. Y., ACORPORA- TION OF NEW YORK.

MECHANICAL MOVEMENT.

Application filed March 6, 1905, Serial No. 248,437.

Specification of Letters Patent.

To all whom it may concern:

Be it known that I, CHARLES J. ROBERT- SON, a subject of the King ofEngland, residing at Taunton, in the county of Bristol and State ofMassachusetts, have invented a new and useful Mechanical Movement, ofwhich the following is a specification.

The object of this invention is to provide a new and improved mechanicalmovement 'for converting rotary motion into reciproranged between tworacks, and a reversing mechanism comprising a revolving wrist-pincooperating with vertical shoes at the ends of the bed, the spacesbetween which shoes form vertical slots. The wrist-pin is carried by thepinion. This mechanism well lends itself to a movement of thethree-revolution type; that is to a movement in which the crankoperating element makes one revolu tion for the main forward movement,one revolution for the main backward movement, and a half turn for eachcrank reverse. It also has been proposed to provide a mechanicalmovement in which a two-revolution pinion is employed, which pinioncarries two wrist-pins, one for reversing the bed at one end of itsmovement, and the other wrist-pin for reversing the bed at the other endof its movement. But it is impossible with this device to obtaina'proper or half-turn crank reverse, because the out-side shoes must becut away to allow the idle-wrist-pin to pass above and below the same.This leads to a continuation of the main working movement at the expenseof the reversing movement, and the reversing movement can only takeplace substantially at the centers of movement of the wrist-pin asdistinguished from a true crank reverse which takes practically a halfturn of the crank element.

As printing presses have been made heavier, and as the demand has comefor higher speeds, it has been found necessary to meet this demand bygiving more time to the reversing movements as compared with the maindriving movements. This has led to the invention of the two-revolutionmovement with a true crank reverse; that is, to a mechanical movement inwhich each main forward and backward movement occupies a half turn ofthe crank element; while each c'ank reverse occupiesa half turn thereofas before described. By this arrangement the speed can be increased asan easier reverse is obtained.

The object of this present invention is to arrange and improve the priormechanical movements shown in said patents so that this advantageousmethod of operation can be obtained. I have discovered that this canwell be done by imparting a movement to the idle-wrist-pm supplementalto its revolution to clear the shoe. By doing this a full true crankreverse can be obtained in this style of two-revolution movement. In thepreferred form of my device, this supplemental movement is synchronouslyimparted to both wrist-pins, and this supplemental movement imparted tothe wrist-pin is such as not to atl'ect the reciprocating movementimparted therefrom to the bed or moving member. The wrist-pin may bemounted directly on the driving pinion, which itself may be used for themain driving mechanism, or preferably may be mounted on a separaterotating part.

The invention consists of further improved details of construction ashereinafter pointed out and claimed.

Referring to the accompanying two sheets of drawings forming part ofthis application, Figure 1 is a sectional side elevation partly indiagram illustrating the movement. Fig. 2 is a cross sectional Viewshowing the relative arrangement of parts. Fig.`

3 is a diagram illustrating the gearing. Fig. 4 1s a view illustratingone of the swinging shoes. Fig. 5 1s a detail of one of the cams whichoperate the swinging shoes, and Figs. 6 to 11 inclusive are diagramsillustrating the operation.

Referring to the drawings and in detail A designates the bed or movingmember which is mounted so as to be capable of reciprocation on theframing of the machine in any of the well understood ways. A gear 10 ismounted on the driving shaft which gear meshes with a gear 11 arrangedon the impression cylinder. Meshing with the gear 10 is a gear 12 whichis arranged on a shaft 13, which shaft carries the driving pinion, 14which is arranged between oppositely disposed racks 15 and 16 secured tothe bed. Meshing with the gear 10 is an intermediate 17 which mesheswith a gear 170 arranged on a shaft 18 which may be termed the mainshaft of the machine. On the inner end of the main shaft is arranged anarm 19, which carries two wrist-pins 20 and 21 set at 180 degrees toeach other. Mounted on the shaft 1S is a gear 22 which meshes with agear 23 on a cam shaft 24. rhe relation of this gearing is such that themain shaft 18 will make two revolutions and the cam shaft 24 will makeone revolution for each cycle or complete reciprocation of the bed. Theimpression cylinder is geared to make two revolutions for each completecycle, so that the mechanism is shown as applied to a machine of thewell-known two-revolution impression-cylinder type. The driving pinion14 and the racks 15 and 16 constitute a main driving mechanism. Thecircumferential pitch speed of the driving pinion 14 is the same as thecircumferential speed of the wrist-pins 2O and 21, so that in e'ect themain driving mechanism is ust the same as if a pinion having a pitchradius the same as the radius of revolution of wrist-pins were employed,the present arrangement being selected merely as one of convenientdesign, and being termed hereafter a reduced main driving mechanism forthe reason that the driving pinion 14 is less in radius than the actualworking radius of the crank-reverse which is the radius at which thewrist-pins 20 and 21 are set. The shaft 13 is journaled in suitable arms25 which are pivoted on the same center as intermediate 10. The arms26-26 carry rollers 27 which engage cams 23 mounted on the cam-shaft 24.The arms 26-26 connect to the arms 25-25 by links 29. By thisarrangement, the driving shaft 13 and the main shaft 18 are raised andlowered synchronously, and the raising and lowering movement imparted tothe main shaft is a larger movement than that imparted to the shaft 13.

Secured to the ends of the bed are outer shoes 30-31. Also secured tothe bed are inner shoes 32 and 33. Partial shoes 320 and 330 supplementthe inner shoes 32 and 33.

These supplemental shoes are mounted on vertical shafts 34 carried bythe bed, which shafts have arms 35 carrying rollers which cooperate withstationary cams 36 in substantially the same manner shown and de`scribed in said Patent No. 322,309. The inner shoes are made in a rigidand supplemental form for purpose of wear, as by this design it is onlynecessary to swing out the supplemental portions thereof, the innershoes and supplemental parts corresponding in function to the innershoes of said Patent No. 322,309.

The operation can be followed by the diagrams Figs. 6 to 11, and is asfollowsz--ln Fig. 6 the bed is supposed to have just completed its mainforward or constant speed movement to the right, the shafts 13 and 13being in their raised positions, and the driving pinion 14 just runningout of the rack 15. The position of the main shaft 1S relatively to theshoes is such that as the parts come to this position, the upperwrist-pin 20 will be in position to pass over the top of the outer shoe30, while the outer shoe 30 will come into engagement with the wristpin21 and as this takes place, the supplemental shoes 320-320 will closeand lock the wrist-pin 21 in the left-hand slot. Said wrist-pin 21 nowbecomes the active controlling member and the wrist-pin 20 which isidle, clears the top of the outer shoe 30. Now as the main shaft 13makes a quarter revolution the wrist-pin 21 working in the left-handslot will retard and bring the bed gradually to a state of rest at itsright-hand extreme position as shown in Fig. 7. Now, during the nextquarter revolution of the main shaft the bed will be started from itsextreme right hand position up to full speed on its movement to the leftby said wristpin 21 working in said slot, bringing Jthe parts to theposition shown in Fig. 3. This last half revolution of the wrist pin 21in the left-hand slot will impart a half turn or true crank reverse tothe bed. As the parts move from the position shown in Fig. 6, to theposition shown in Fig. S, the main shaft 13 and the driving shaft 13will be lowered, whereby when the idle wrist-pin 20 comes around underthe outer shoe 30, it will pass under the same and when the activewrist* pin 21 comes to the upper part of the slot it will stay thereinas shown in Fig. 8. As the main shaft 18 is lowered the driving shaft13will also be lowered so that the driving pinion 14 will take into thelower rack 16. Now during the next half revolution of the wrist-pin, themain driving mechanism will move the bed to the left at a constant speedby reason of the engage,- ment of the driving pinion 14 with said lowerrack 16, and will impart the main or constant speed movement to the bedto the left.

14 with the upper yack 15.

This will bring the parts to the position shown in Fig. 9. Theright-hand outer shoe 31 will now come into contact with the wrist-'pin20 which now becomes the active operating instrumentality and theswinging inner shoes 330 and 330 will be moved to lock said wrist-pin2() in the right-hand slot. As this action takes place, it will be seenthat the wrist-pin 21 which is now the idle wrist-pin can passunderneath the outer shoe 31 by reason of the lowered position of themain shaft 18. New during the next quarter revolution of the main shaftthe bed will be gradually brought from full speed torest at its extremeleft-hand position by the wrist-pin 20 working in the right-hand slot.This will bring the arts to the position shown in Fig. 10. l ow duringthe next quarter revolution of the main shaft the bed will be started onits movement to the right at a speed commencing from zero and graduallyincreasing up to full speed by said wrist-pin 2O working in said slot.The last described half revolution of the main shaft 18 will'thus imparta true crank or half turn reverse to the bed. During this crank reverse;that is, while the parts move from the position shown in Fig. S) to theposition shown in Fig. 1l, the main shaft 1S and the driving shaft 13will be raised, and by this operation the wrist-pin 21 which is idlewill clear the top of the outer shoe 81 and the wrist-pin 20 which hasbeen act-ing will remain in the slot. The upward movement of the shaft13 will mesh the driving pinion New during the next half revolution ofthe crank-pins, the bed will be moved by the main driving mechanism onits main or constant speed movement to the right. This will bring theparts back to the position shown in Fig. G. Thus a cycle is completed,the cycle being divided so that the main backward and forward orconstant speed movements of the bed each occupy a half turn of thewristpins, and so that each reverse occupies a half turn of thewrist-pins, whereby a two revolution movement is produced which has atrue or half turn crank reverse at each end. The vertical rising andfalling movement of the main shaft 18 will not substantially affect themovement of the bed as the same is substantially a movement parallelwith the slots which are vertical.

As previously stated the invention can be ap lied to the structure inPatent No. 31 ,663, wherein the -two wrist-pins are carried on the maindriving pinion; but the construction previously described; that is, onewith a reduced main driving mechanism, is preferred, as it gives astronger construction of wrist-pins. The invention is also well adaptedto a four revolution movementin which the main Working movement occupiesone and a half revolutions in each direction and a half revolution foreach reverse.

The' details herein shown and described may be greatly varied by askilled mechanic without departing from the scope of my invention asexpressed in the claims.

Having thus fully described my invention, what I claim and desire tosecure by Letters Patent is 1. ln a mechanical movement, the combinationofthe bed, a main driving mechanism therefor, shoes :arried by the bed,`the space between the same forming reversing slots, two revolvingwrist-pins, and connections whereby one wrist-pin will engage one slotfor a half revolution for one reverse, and the other wrist-pin the otherslot for a half revolution for the other reverse, and operatingconnections whereby each main speed movement will occupy a halfrevolution of the wrist-pins so that a two-revolution movement isobtained with a half revolution crank reverse at 4each end.

2. In a mechanical movement, the combination ot' the bed, a reduced maindriving .mechanism therefor, shoes carried by the bed, the space betweenthe same li'orming reversing slots, two-revolving wrist-pins, andconnections whereby one wrist-pin will engage one slot for a halfrevolution for one reverse, and the other wrist-pin the other slot for ahalt revolution for the other reverse, and whereby each main speedmovement will occupy a half revolution of the wrist-pins so that atwo-revolution movement is obtained with a half revolution crank reverseat each end.

3. ln a mechanical movement, the combination of the bed, a main drivingmechanism therefor, shoes-carried by the bed, the space between the sameforming a reversing slot, two revolving wrist-pins, and means forin'xparting a movement to the idle wristpin supplemental to itsrevoh'ition to clear the outer shoe.

4l. l'n a mechanical movement, the combination of the bed, a maindriving mechanism therefor, shoesI carried by the bed, the space betweenthe same forming a reversing slot at each end of the bed, two revolvingwrist-pins, and means for imparting movements to the two wrist-pinssupplemental to their revolution, so that one wrist-pin will clear theouter shoe at one end of the bed, and the other wrist-pin will clear theouter shoe at the other end of the bed by reason of such supplementalmovement.

5. ln a mechanical movement, the combination of the bed, a main drivingmechanism therefor, shoes carried by the bed, the space between the sameforming` a vertical or straight slot at each end of the bed, twowrist-pins mounted on a revolving part, and

shoe at one end of the bed, and the other wrist-pin will clear the outershoe at the other end of the bed.

6. In a mechanical movement, the combination of the bed, a main drivingmechanism therefor, outer shoes carried by the bed, swinging inner shoescarried by the bed, two revolving wrist-pins, and means for impartingmovements to the wrist-pins so that the idle wrist-pin at each reversewill clear the operative outer shoe.

7. In a mechanical movement, the combination of the bed, a main drivingmechanism therefor, shoes carried by the bed, the space between thesameforming slots, a tworevolution main driving shaft, two wristpins carriedthereby, and cam mechanism for raising and lowering the main shaft sothat the idle wrist-pin will clear the outer shoe.

8. In a mechanical movement, the combination of the bed, a main drivingmechanism therefor, shoes carried by the bed, the space between the sameforming a reversing` slot at each end of the bed, two revolvingwrist-pins, one of which reverses the bed at one end of its movement,and the other at the other end of its movement, and means for moving thewrist-pins supplemental to their revolution so that as the activewrist-pin engages between the ends of the shoes, the idle wrist-pin willclear and so that this relative position will be changed, whereby whenthe active wrist-pin has run through the slot and engages the other endof the shoes, the idle wrist pin also will clear.

9. In a mechanical movement, the combination of a bed, a main drivingmechanism therefor, consisting of racks and a driving pinion, shoescarried by the bed, a main driving shaft carrying two wrist-pins, andmeans for raising and lowering the driving pinion and the main shaft.

lO. In a mechanical movement, the combination of a bed, a main drivingmechanism therefor, consisting of racks and a driving pinion, shoescarried by the bed, a main driving shaft carrying two wrist-pins, yand acam mechanism for raising and lowering both the driving pinion and themain shaft, this movement of the main shaft being larger than that ofthe driving shaft.

ll. In a mechanical movement, the combination of a bed, a main drivingmechanism therefor eonsisting of racks and adriving pinion, shoescarried by the bed, a main driving shaft carrying two wrist-pins, and acam mechanism for raising and lowering the driving pinion and the mainshaft, this movement of the main shaft being larger than that of thedriving pinion.

12. In a reversing mechanism in a mechanical movement, an outer shoe anda partial inner shoe rigidly attached to the bed, shoes supplementingthe inner shoe to make up the full inner shoe, and means for operatingthe supplemental shoe.

In testimony whereof I have hereunto set my hand, in the presence of twosubscribing witnesses.

C. J. ROBERTSON.

Vitnesses ROBERT T. JoiiNs'roNn, FRED J. VIEWEG.

